TP decreased sharply in the first two weeks in the mixture pattern as compared with the monoculture patterns and
then stabilized at a low level (Figure 1). On August 26, the TP concentration in water had decreased by about 54%
compared with the concentration a week before; and a week later, on September 2, the TP concentration again
sharply decreased compared with the concentration of August 26, by about 44%. After that point, TP concentration
in water remained below 0.1 mg l-1.